Shepherd Lara D, Perrie Leon R, Brownsey Patrick J
Museum of New Zealand Te Papa Tongarewa, Wellington, New Zealand.
Mol Phylogenet Evol. 2008 Oct;49(1):240-8. doi: 10.1016/j.ympev.2008.06.015. Epub 2008 Jul 2.
Recent generalisations about polyploidy in plants have been largely based on studies of angiosperms. A compelling group to compare with angiosperms is ferns, because of their high polyploidy. The bi-parental inheritance of nuclear DNA sequence markers makes them advantageous for investigating polyploid complexes, but few such markers have been available for ferns. We have used DNA sequences from the low-copy nuclear LFY locus to study an Asplenium polyploid complex. The New Zealand species of this Austral group comprise seven tetraploids and eight octoploids. LFY sequences indicate that allopolyploidy is much more predominant than previously thought, being implicated in the origins of seven of the octoploids. One of the tetraploids has had a central role, being a progenitor for five of the octoploids. All of the octoploids appear to have relatively recent origins, with the dynamic environmental conditions of the Pleistocene possibly playing a role in their formation and/or establishment.
近期关于植物多倍体的概括主要基于对被子植物的研究。蕨类植物是与被子植物进行比较的一个引人注目的类群，因为它们的多倍体程度很高。核DNA序列标记的双亲遗传特性使其在研究多倍体复合体方面具有优势，但蕨类植物可用的此类标记很少。我们利用来自低拷贝核基因LFY位点的DNA序列研究了铁角蕨属多倍体复合体。这个澳大利亚类群的新西兰物种包括7个四倍体和8个八倍体。LFY序列表明，异源多倍体比以前认为的更为普遍，在8个八倍体中的7个的起源中起作用。其中一个四倍体发挥了核心作用，是5个八倍体的祖先。所有八倍体似乎都有相对较近的起源，更新世动态的环境条件可能在它们的形成和/或建立过程中发挥了作用。
